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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(4*K)/x = n // - n
(4*K)/x-n = 0
4*K*x^-1 = n // : 4*K
x^-1 = n/(4*K)
-1 < 0
1/(x^1) = n/(4*K) // * x^1
1 = (n/(4*K))*x^1 // : n/(4*K)
4*K*n^-1 = x^1
x = 4*K*n^-1
x = 4*K*n^-1
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